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Investment Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Estimated Fair Value | $ 1,093,816 | $ 1,258,139
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
U.S. Government sponsored entities’ asset-backed securities | 357,197 | 259,833
Fair value of securities held-to-maturity | 363,779 | 256,672
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis | 120,000 |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value | $ 119,499 |
Available for Sale Securities Debt Maturities next twelve months Weighted Avg Yield | 1.14% |
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Due one through five years | $ 125,000 |
Total | 245,000 |
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Due one through five years | 123,221 |
Estimated Fair Value | $ 242,720 | 267,533
Available for Sale Securities Weighted Avg Yield | 1.22% |
Available for Sale Securities Debt Maturities After One Through Five Years Weighted Avg Yield | 1.29% |
Obligations of States and Political Subdivisions |  |
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount | $ 2,454 |
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value | $ 2,462 |
held to maturity securities weighted avg yield yrs 5-10 | 3.61% |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount | $ 297,958 |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value | 303,812 |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
U.S. Government sponsored entities’ asset-backed securities | 300,412 | 188,622
Fair value of securities held-to-maturity | $ 306,274 | 184,451
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Held to Maturity Securities weighted avg yield | 4.46% |
U.S. Government sponsored entity asset-backed securities |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Total | $ 852,645 |
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Estimated Fair Value | $ 849,161 | 987,172
Available for Sale Securities Weighted Avg Yield | 2.09% |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
U.S. Government sponsored entities’ asset-backed securities | $ 56,785 | 71,211
Fair value of securities held-to-maturity | $ 57,505 | $ 72,221
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Held to Maturity Securities weighted avg yield | 3.16% |

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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